wesselmann



y (No Model.) v 3 Sheets-Sheet 1.

B. WBSSELMANN.

r DIE STOGK;

No. 309,755. Patented Deo. 2.3, 1884.

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3 Sheets- Sheet 2.

(No Model.)

B. WESSELMANN.

. DIE STOCK. No. 309,755. Patented Deo. 23, 1884.

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3 Sheets-Sheet 3.

(No Model.)

B. WBSSBLMAN-IN.

DIE STOCK.

No. 309,755. Patented Dec. 23, 1884.

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UNITED STATES aTnT FFECE@ BRUNO VESSELMANN, OF HAMBURG, GERMANY.

DIE-STOCK.

SPECIFICATION forming part of Letters Patent No. 309,755, dated December 23, 1884.

Application tiled April 8, 1884.

To all whom t may concern:

Beit known that I, BRUNO WnssELMANN, a subject of the German Emperor,and aresident of Hamburg, in the German Empire, have invented certain new and useful'mprovements in Die-Stocks, of which the following is a specificati-on.

My invention relates to the class of diestocks which employ removable dies; and it consists of the improved die-stock, as hereinafter described, and set forth in the claims.

Figure l is a top View of a die-stock which embodies part of my invention with the locking-nut removed, and Fig. 2 is a vertical section through the center of the same. Fig. 3 shows side views of the cutting-disks composinga die. Fig. 4 is a top view of a complete die-stock for a right-hand thread embodying all of my invention, and Fig. 5 is a vertical section of the same on the line C D, Fig. et. Fig. 6 is a top View ofthe same die-stock ar ranged for cutting a left-hand thread, the locking-nut being removed, and Fig. 7 is a vertical section thereof on the line E F, Fig. 6. Fig. Sis a sectional side elevation ol" the adjustable knives on the line I l, Fig. i. Fig. 9 is a cross-section thereof on the line G H, Fig. et, and Figs. 9L and 9" are detached views ofthe knives.

The dies are composed of a number of cut ting-disks, c, placed one above another inside of the ring X ofthe stock, and they are clamped i and held together by means of the-nut b, which latter' screws into the ring X above the disks'.

On the inside ot' the ring X there are lugs or projections c, which engage with corresponding notches or recesses in the edges of the disks @,ior the purpose of locking the latter and preventing them from turning.

On theinterior of each of the disks there are formed the several sets of screw-cutting teeth, ai, preferably three, as shown, and the disks are so located within the ring X that the teeth of one disk alternate with those of the next, though they may come inline with each other.

In order to provide for adjustments of the cutting-teeth for cases where it is desired to l out deeper than usual, or where the disks become worn, I makeone of the disks adjustable, and also provide adjustable cutting-knives, which latter are also available for use as accessory cutters in the ordinary use of the die- (No model.)

stock. The upper disk, a', is made with a radial slit, ci, a narrow radial section ofthe disk being removed, so that it becomes an open spring-ring, one end of which can be pressed in toward the center of the disk by means of the adj usting-screw d. By turning the screw in, the cutting-teeth carried by that end ofthe disk are made to project fartherinto the open center ofthe disk, thus causing them to cut deeper.

Attached to one side of the stock-ring there .is a bearing or extension, g, which carries apair of knives or chisels, e, of the shape illustrated by Fig. 9". These chisels are attached to a sliding block, z', sliding within the bearing g, and the screw 7L bears against the back side of the block, and is employed to adjust said knives. A coiled spring, f, encircling the chisels,is interposed between the sliding block and the stock-ring, and operates to withdraw the chisels or knives when the screw h is unscrewed. A pair of chisels are employed in o rder to present two cutting-points, as shown by Fig. 8, each ofthe chisels being sharpened with a A-edge. This enables the chisels to be easily sharpened. The chisels project through an opening, c', in the stock-ring, and an oblique slit in the cap-ring or washer, p. The spring c is inclined according to the pitch of the thread-viz., for a right-hand thread toward one side, and for a lett-hand thread in the opposite direction. y It will be understood that the same tool i adapted to be used for cutting both right and left hand threads, and to this end two openings, c', for the chisels are provided, as shown by Fig. 7, and the chisel-holder g is made reversible. For this lastnamed purpose the chisel-holder is made with the curved arms or lugs g g", for the purpose of attachment to the stock-ring,to which it is screwed by means of the bolt o', that passes through the lug g and one of the die stock handles. rIhis latter screws into the side ofthe stock-ring, and the screw end of one or the other of the handles, after being removed, is passed through the lug g, according to the direction to be given to the slope of the threads, and then screwed into place. The cutting-disks and the cap-ring p are also reversed when the tool is changed from a right to a left hand cutter, or vice versa. A modification of the chisels is shown by IOO Fig. 9". The chisels are in this case made with oblique cutting-edges e2, and they are placed with the lines of their cutting-edges reversed, so that they cross each other, and each chisel has preferably a notch, e, cut out from its point, so that the euttingpoint ofthe chisel is brought in near the center line, in order that the cutting-points of the two chisels, when placed in position, may be near each other and overlap only for a short distance, a s shown, instead of for the entire width of the chisels,

It will be seen that when the die-stock is turned in one direction for cutting a thread only one of the knives comes into action; but when the die-stock is turned in the reverse direction the other knife will out, thus producing a very clean cut and sharp serewrthread. XVhen duplicate eutting-ehisels of this form are employed, each knife is made separately adjustable. Consequently two adjustingscrews, h, and two retracting-springs,f-one for each chisel-are used. The arrangement of these devices will be readily understood without illustration.

Having thus fully described my invention, what I desire to claim and secure by Letters Patent is l. In die-stocks, the combination of disks a, arranged axially one above the other, with the ring x and nut b, or its equivalent, substa-ntially as set forth.

2. In die-stocks, the combination of the slotted disk a with the screw d and solid disks a within the ring x, substantially as and for the purpose specified.

3. In die-stocks, the combination of the ring x with the bearing g, knives or chisels e, or their equivalents, as illustrated by Fig. 9", slide-piece i, adjusting-screw lz., and spring f, substantially as and for the purpose specified.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 11th day of March, 1884.

BRUNO WESSELMANN.

Witnesses:

ALEXANDER Srnolrr, Drnnnrcrr PnTnnsEN. 

